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/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsISupports.idl"

/**
 * nsIIDNService interface.
 *
 * IDN (Internationalized Domain Name) support. Provides facilities
 * for manipulating IDN hostnames according to the specification set
 * forth by the IETF.
 *
 * IDN effort:
 * http://www.ietf.org/html.characters/idn-charter.html
 * http://www.i-dns.net
 *
 * IDNA specification:
 * http://search.ietf.org/internet-drafts/draft-ietf-idn-idna-06.txt
 */

[scriptable, uuid(a592a60e-3621-4f19-a318-2bf233cfad3e)]
interface nsIIDNService : nsISupports
{
    /**
     * Prepares the input hostname according to IDNA ToASCII operation,
     * the input hostname is assumed to be UTF8-encoded.
     */
    ACString convertUTF8toACE(in AUTF8String input);


    /**
     * This is the ToUnicode operation as specified in the IDNA proposal,
     * with an additional step to encode the result in UTF-8.
     * It takes an ACE-encoded hostname and performs ToUnicode to it, then
     * encodes the resulting string into UTF8.
     */
    AUTF8String convertACEtoUTF8(in ACString input);

    /**
     * Checks if the input string is ACE encoded or not.
     */
    boolean isACE(in ACString input);

    /**
     * Performs the unicode normalization needed for hostnames in IDN,
     * for callers that want early normalization.
     */
    AUTF8String normalize(in AUTF8String input);

    /**
     * Normalizes and converts a host to UTF-8 if the host is in the IDN
     * whitelist, otherwise converts it to ACE. This is useful for display
     * purposes and to ensure an encoding consistent with nsIURI::GetHost().
     * If the result is ASCII or ACE encoded, |isASCII| will be true.
     */
    AUTF8String convertToDisplayIDN(in AUTF8String input, out boolean isASCII);
};